The role of temperature on dielectric relaxation and conductivity mechanism of dark conglomerate liquid crystal phase
作者:Alptekin Yildiz、Nimet Yilmaz Canli、Zeynep Güven Özdemir、Hale Ocak、Belkız Bilgin Eran、Mustafa Okutan
DOI:10.1016/j.physb.2015.12.050
日期:2016.3
temperatures revealed that DBB system exhibits nearly Debye-type relaxation except for 125 °C. Moreover, it has been determined that while the relaxation frequencies shift to higher frequencies as the temperature increases from 25 °C to 125 °C, the peak intensities remarkably decrease with increasing temperature. According to Cole–Cole plot and phase angle versus frequency curve, it has been determined that
摘要 本研究研究了弯芯液晶3′-4-[4-(3,7-二甲基辛氧基)苯甲酰氧基]苯甲酰氧基}-4-4-[4-[6- (1,1,3,3,5,5,5-heptamethyltrisiloxan-1yl)hex-1-yloxy]benzoyloxy]benzoyloxy}联苯 (DBB) 已经通过不同温度下的阻抗谱测量进行了分析。根据偏光显微镜的结果,DBB 液晶化合物呈现出深色的团聚中间相(DC [*] 相),可以通过出现具有相反手性的畴团团来识别。通过旋转偏振器,这种低双折射中间相的手性域变得更加明显。分析了介电常数实部(e′)和虚部(e″)随角频率的变化以及DBB的Cole-Cole曲线。不同温度下色散曲线的拟合结果表明,除了 125 °C 外,DBB 系统表现出近似德拜型弛豫。此外,已经确定,虽然随着温度从 25 °C 升高到 125 °C,弛豫频率会向更高频率移动,但峰值强度会随着温度的升高而显着降低。根据